Brush-holder.



W. A. TUBBAYNE.

BRUSH HOLDER. APPLICATION FILED AUG. 8, 1901.

916,065. Patented Mar.231909.

U'urr D s'rairns "WILLIAM A. TU RBAYNE, U1" LANVAS'IER, NltW YORK, COMPANY, OF NEW 'YORK, l

BRUSH-HOLDER.

Llolders, of which the followingisla speci- .lication.

This invention relates more particularly to brush holders for dynamo electric ma chines, of that sort in which the brush or carbon .is held yieldingly against the surface of; the commutator by apressure device andis movable in and outer toward and from the commutatorin a guide on theholder. The objects of the invention are to provide air-efficient and desirable brush holder of simple andinexpensive construction in which the" brush or carbon has a relatively great range oi movement and will not bind in the holder; also to provide the holder with a pressure device which can be quickly and easily adjusted without tools to regulate the pressure of the brush or carbon on the coinmutator; also tosocons'truct the brush holder that the brush or carbon can be readily removed and replaced when worn or broken; and also to provide the carbon with a hearing or saddle for the pressure lever which preven the lever-from wearing or breaking the carbon.

In the accompanying drawings: Figure 1 is a side elevation of a brush holder embodying the invention. Fig. 2 is a plan view thereof. Fi 3 is a fragmentary longitudinal sectiona elevation thereof, showing a different adjustment of the pressure spring.

Like letters of're'l'm'cnco refer to like parts in the several figures.

A re resents the holder frame or bracket, which 1s secured on a suitable support or rod B appropriately arranged adjacent to the commutator, the surface of W iich latter isindicated by the curved line (I. The bracket shown :in the drawings is provided between is ends with an ordinary s lit clamping sleeve (rand a bolt or screw a 101' adjustably sernri ng" it on the supporting rod B. The q in iorti'on'of-the bracket at one side of the (i atpping sleeve is preferably made in skeleton form to reduce the weight of the holder andv is provided. at its outer end with a rectangular guidecup or opening (1 for the brush carbon 1). The bracket has spaced BEST AVAlLABLE COP.

Par ENT OFFICE.

SSIGNUR T0 GOULD COUPLER. i Y:

Specification of Lette rs Patent. I Patented March 23, 1909. Application filed. August 8, 1907. Serial No. 381,640.

parallel bearing arms a projecting from the opposite side of the clamping sleeve for supporting the pressure lever "for the brush.

flhe brush carbon is onfined laterally in the guide lbop a of the bracket but is free to slide in and outtherein, or toward and from the connnutator, to adjust itself .to the surface of the latter and gradually move inward to maintain cont-act with the commut-atoras the" carbon wears away. The usual flexible conductor d is connected at opposite ends by suitable screws or other means (1 d? to the brush and holder bracket.

E represents a pressure arm or lever which is pivoted at one end to the hearing arms a of the bracket with its other or free end held on the brush D by a suitable sprin or springs F attached to the bracket and to the pressure lever. Preferably the pivot end-of the. pressure lever is forked or bifurcated and the spring F arranged between the fork branches of the lever with its inner end hooked into a perforated lug c on the clamping sleeve of the bracket, or otherwise attached to the bracket, and a handle, loop o the like (i attached to its outer. end resting in notches or seats g in the branches of the forked end of the lever. A series of opposite notches or seats are provided in the branches of the lever so that by engaging the loop (l in a pair of notches nearer to or farther from the fulcrum of the lever the pressure on the brush is correspondingly decreased or increased. Thus by engaging the loop in one or another of the mins of seats in the lever the pressure of the lever on the brush and consequently the pressure of the brush on the connnutator can be regulated as desired or found necessary. The loop can be readily grasped, lifted out of one pair of seats and placed in another pair and it will be firmly held by the spring in the seats in which it is placed, thus making possible a very quick and easy adjustment ofthc lever pressure. 1

The )ressure lever E is so located that its free end, which bears on the brush, swings in an are very nearly parallel with the direct ion of movement of the brush in the guide loop, thereby reducing to the minimum the lateral .pressure on the brush which would tend to cause it to bind in its guide loop. 'lhe lever is also preferably bent, or its ends extend at an angle from the middle part of the lever toward the brush and fulcrum, thereby all'ording ample room between the lever, and bracket for the pressure spring and cryi'euctor d and enabling the use of a longer] pring F. Furthermore, this form of the "ver so locates the seats for the spring le' 'p that they recede from the lever pivo s they rccede from the point oi :u'tachmeni if the spring to the bracket, thus requiring the spring to be stretched farther and farther as its loo is ad' justed away from the lever pivot and t ereby increasing the tension of the spring as well as its leverage so that a greater range of adjust ment of the pressure on the brush is secured.

H represents a bearing piece or saddle secured on the outer end of the brush carbon and forming a seat for the end of the pressure lever to prevent the same from directly engaging and wearing or breaking the carbon. The saddle is prelerably made of a strip of copper or other good conducting material bent into substantially M-sha )e with the ends embracing and secured to the end of the carbon by the bolt d which fastens the con ductor (Z to the carbon. The end of the pressure lever, which is )referabl v rounded and laterally extended, bears in the depressed central part of the saddle in which it is held from displacement but allowed the necessary rocking movement. In addition to forming a bearing f or the lever the saddle strengthens and improves the connection of the conductor d with the carbon, can be readily lifted out of the saddle and the carbon removed and replaced when broken I claim as myinvention'.

1. The combination of a brush carbon, or 1 The pressure levfer loosely confined, a lever which is pivoted to said frame and has a rocking: hearing at its free end on the outer end of said brush for pressing the brush against the commutator, a spring attached to said frame, and a. )fl-Il) attached to said spring and seated on sai lever and being adjustable thereon to regulate the pressure of the lever on the brush, substantially as set forth.

2'. The combination of a brush carbon, or the like, a frame provided with a relatively short guide opening in which said carbon is loosely confined, a lever which is pivoted at one end to said frame and has a rocking bearing at its free end on the outer end of said caroon, a coil spring attached at one end to said frame between the ends thereof, and a handle attached to the other end of said spring and bearing on said lever between the ends thereof, said lever having a plurality of open seats to receive said handle for regulating the pressure oi said lever on the carbon, substantially as set forth.

3. The combination of abrush carbon, or the like, a frame provided with a guide for said carbon, a spring-pressed lever pivoted on said frame, and a saddle lined to the outer end oi said carbon and consisting of a metal strip having ends which embrace and are secured to said carbon and a depression between said ends in which 'said leverhas a rocking bearing, substantially as set forth.

l/Vitness my hand, this 29th day 01 July, 1907.

\YILLIAM A. TURBAYNE.

W'itnesses:

E. Hum), C. B. l'IORNBECK. 

